Gut Bacteria Produce Brain-altering Drugs

Lyte lists these neurochemicals produced by various microbial species:

Lactobacillus, Bifidobacterium

GABA

Escherichia, Bacillus, Saccharomyces

Norepinephrine

Candida, Streptococcus, Escherichia, Enterococcus

Serotonin

Bacillus, Serratia

Dopamine

Lactobacillus

Acetylcholine

All of the above are neurotransmitters/hormones already normally employed. Also, more is not necessarily better. I think they’re all somewhat common in our guts (I didn’t verify all of them). I don’t know whether a course of antibiotics completely eradicates gut bacteria (I’m guessing not), but presumably you’ll end up hosting some population or another absorbed from ingestion or respiration, even if your gut is briefly sterilized.